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Stress analysis of internal carotid artery with low stenosis level: the effect of material model and plaque geometry

Shahidian, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1142/S0219519417500981
  3. Abstract:
  4. Stress concentration in carotid stenosis has been proven to assist plaque morphology in disease diagnosis and vulnerability. This work focuses on numerical analysis of stress and strain distribution in the cross-section of internal carotid artery using a 2D structure-only method. The influence of four different idealized plaque geometries (circle, ellipse, oval and wedge) is investigated. Numerical simulations are implemented utilizing linear elastic model along with four hyperelastic constitutive laws named neo-Hookean, Ogden, Yeoh and Mooney-Rivlin. Each case is compared to the real geometry. Results show significant strength of oval and wedged geometries in predicting stress and strain values. Our results emphasize that Yeoh and Ogden hyperelastic materials are more reliable in stress prediction with errors less than 3%. The same concept is observed in locating critical stresses where oval and wedged plaque geometries are the most accurate models. Similar results are observed in predicting maximum principal elastic strain with errors less than 1%. However, the strain distribution in idealized plaque models showed a considerable difference in comparison with real geometry. © 2017 World Scientific Publishing Company
  5. Keywords:
  6. Constitutive modeling ; Finite element analysis ; Constitutive models ; Diagnosis ; Elasticity ; Finite element method ; Forecasting ; Hemodynamics ; Numerical methods ; Stress analysis ; Analysis of stress and strains ; Carotid artery ; Disease diagnosis ; Geometry idealization ; Hyperelastic materials ; Internal carotid artery ; Linear elastic model ; Strain distributions ; Geometry
  7. Source: Journal of Mechanics in Medicine and Biology ; Volume 17, Issue 6 , 2017 ; 02195194 (ISSN)
  8. URL: https://www.worldscientific.com/doi/abs/10.1142/S0219519417500981